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Example of the water-level task. In 1, a bottle of water sits upright on a table, with the water level marked in blue. In 2, the bottle has been tilted on its side (in this case, by 45 degrees). The respondent must mark the new water level.
The 45th parallel north is often called the halfway point between the equator and the North Pole, but the true halfway point is 16.038487 km (9.965854 mi) north of it (at approximately 45°08'39.544") because Earth is an oblate spheroid; that is, it bulges at the equator and is flattened at the poles. [1]
45° S: New Zealand; Chile; Argentina: 60° S: Entirely ocean (slightly north of the South Orkney Islands); sometimes considered the northern boundary of the Southern Ocean: 75° S: Dome C, Antarctica: 90° S South Pole
There are 89 integral (whole degree) circles of latitude between the Equator and the poles in each hemisphere, but these can be divided into more precise measurements of latitude, and are often represented as a decimal degree (e.g. 34.637° N) or with minutes and seconds (e.g. 22°14'26" S).
The equator, a circle of latitude that divides a spheroid, such as Earth, into the northern and southern hemispheres. On Earth, it is an imaginary line located at 0 degrees latitude . 0°
Consider e.g. the value of ("east displacement") when and are on either side of the ±180° meridian, or the value of ("mean latitude") for the two positions (=89°, =45°) and (=89°, =−135°). If a calculation based on latitude/longitude should be valid for all Earth positions, it should be verified that the discontinuity and the Poles are ...
at latitude 85° the scale factor is k = sec 85° = 11.5. The area scale factor is the product of the parallel and meridian scales hk = sec 2 φ. For Greenland, taking 73° as a median latitude, hk = 11.7. For Australia, taking 25° as a median latitude, hk = 1.2. For Great Britain, taking 55° as a median latitude, hk = 3.04. The variation ...
However, at a latitude of about 25 degrees the value of is about 1.1 so Mercator is accurate to within 10% in a strip of width 50 degrees centred on the equator. Narrower strips are better: a strip of width 16 degrees (centred on the equator) is accurate to within 1% or 1 part in 100.
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